Often, when a highway crosses a railroad, the railroad company was still responsible for the design and construction of a bridge to form a grade separation, as opposed to having the road owner design and construct the bridge. Such bridges tend to display unusual design features because as highway bridges they are often lighter weight bridges than bridges built to carry trains, while still displaying a railroad company thinking in terms of bridge design. Surviving examples tend to be significant and worthy of preservation, and the L Avenue Bridge is no exception. The unusual bridge is one of two in the similar bridges county (the other was not documented by HistoricBridges.org). The L Avenue Bridge consists of diagonal members composed of paired, riveted angles and a top chord and end post composed of a combination of riveted angles and plate. The utilitarian design and lack of lattice and v-lacing is typical of many highway over railroad bridges designed by railroad companies.
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